55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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*
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* dmesg - display/control kernel ring buffer.
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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* Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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#include <unistd.h>
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#include <sys/klog.h>
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int dmesg_main(int argc, char **argv);
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int dmesg_main(int argc, char **argv)
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{
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char *size, *level;
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int flags = getopt32(argc, argv, "cs:n:", &size, &level);
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if (flags & 4) {
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if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
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bb_perror_msg_and_die("klogctl");
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} else {
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int len;
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char *buf;
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len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
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buf = xmalloc(len);
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if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
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bb_perror_msg_and_die("klogctl");
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// Skip <#> at the start of lines, and make sure we end with a newline.
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if (ENABLE_FEATURE_DMESG_PRETTY) {
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int last = '\n';
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int in;
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for (in = 0; in<len;) {
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if (last == '\n' && buf[in] == '<') in += 3;
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else putchar(last = buf[in++]);
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}
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if (last != '\n') putchar('\n');
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} else {
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write(1,buf,len);
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if (len && buf[len-1]!='\n') putchar('\n');
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(buf);
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}
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return 0;
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}
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